Hi
I need help with this fault code F12. Every time i go to the job its on F and then solid red light or F12 and red light. But when i turn it off and on and test it everything works until a few hours later i get a phone call saying its gone to F12 again.
I have in my van the PCB board and display board etc for the boiler but don't want to replace them if they don't need them as if i open them i can't take them back. Is there a way of testing this fault? I seen this on another forum:
F12 fault. This is a communication error between the PCB's. I would suggest taking off the low voltage components as they can cause an interuption on the signal between the boards. These are J1, J4 and J2 on the main pcb. It will then show you another fault. If it shows a fault other than F12 then one of the low voltage components is causing the issue. Its a process of elimination test which means you put one plug on at a time and see which is causing the issue.
If it goes back to F12 when you take these plugs off i would suggest checking the harness to the display which is J13 (5 red wires). If thats ok its most likely an issue with the display board. Sometimes when these boards are changed they do not recognise one another so it can cause issues like this.
[FONT=verdana, arial, helvetica, sans-serif]I Will try this but didn't know if anyone had any other ideas as its a bit hard to find a fault when it starts to work and stay working for abit.
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Any help would be appreciated.
I need help with this fault code F12. Every time i go to the job its on F and then solid red light or F12 and red light. But when i turn it off and on and test it everything works until a few hours later i get a phone call saying its gone to F12 again.
I have in my van the PCB board and display board etc for the boiler but don't want to replace them if they don't need them as if i open them i can't take them back. Is there a way of testing this fault? I seen this on another forum:
F12 fault. This is a communication error between the PCB's. I would suggest taking off the low voltage components as they can cause an interuption on the signal between the boards. These are J1, J4 and J2 on the main pcb. It will then show you another fault. If it shows a fault other than F12 then one of the low voltage components is causing the issue. Its a process of elimination test which means you put one plug on at a time and see which is causing the issue.
If it goes back to F12 when you take these plugs off i would suggest checking the harness to the display which is J13 (5 red wires). If thats ok its most likely an issue with the display board. Sometimes when these boards are changed they do not recognise one another so it can cause issues like this.
[FONT=verdana, arial, helvetica, sans-serif]I Will try this but didn't know if anyone had any other ideas as its a bit hard to find a fault when it starts to work and stay working for abit.
[/FONT]
Any help would be appreciated.
